Skiving-machine.



P. P. W. C, KRIPPBNDORF. SKIVING MACHINE.

APPLIGATION. FILED 1m30, 1908.

Patented Allg. 11, 1914.

2 SHEETS-SHEET 1.

P F. W. C. KRIPPENDORF.

SKIVING MACHINE. APPLIQATION FILED Arnau. 19os.`

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I UNITED STATES PATENT Oruroe Y, BAULE. wfc. KEIPPENDOEE, or LYNN,l MASSACHUSETTS, ASSIGNOR To UNITED SHOE MACHINERY COMPANY, or PATEESON, NEW JERSEY, A CORPORATION OE NEW JERSEY.

I f To allwhom t may concern.'

i Be itknown that I, PAUL, F; W. C. KmrrEN- nORr,'a citizen of the UnitedStates, residing at Lynn, inthe county of Essex and State of i' SMassachusetts, have invented an Impr0ve-.

- ment. in Skiving-Machines, of which the fol- A lowing description, in connection with 'the accompanying drawing, is a specification,

Avrlike-letters on the drawing representing like A This invention relates to a machine for skiving leather and similar material, in which the cutting element is constituted as a rotary cylindrical knife.

'blade vwhich is made of a thin, flexiblestrip of steel capable of being readily and cheaply renewed.`

Another-feature provides for the axial adjustment of the cylindrical cuttingblade so Athat its'cutting edge will' always remain inV the same plane, thus maintaimng at all tlmes the proper relation of the cutting blade, the

feeding instrumentalitie's, and the material being skived. 4

Another feature resides in the means for sharpening thev cutting blade and maintaining it in a sharpened condition during the operation of the machine and without inter- 30.fering therewith.' l

j. Another feature resides in the means for adjust-ing the angle and the Width of the skiving, which is secured by this invention'in .a simple and effective manner for a wide y `range of work.`

Other features of the invention, including f -the means for discharging the skiving from the machine, the means for supporting and rotating the cutting member and for clamp- 40 ing the cutting blade therein, will appear from the accompanying description and drawings," and will be more particularly pointed out in the appended claims.

`The drawingsgrepresent the invention in its preferred form as designed in a machine for skiving Vupper leather. vI n the drawings, Figure 1 is a front eleva- `tion of the machine with parts bro-ken away. lFig. 2 is a top plan view of the machine with parts broken awayand with the cutting I member shown incross-section. Fig. 3A is a detail,-partially-in cross-section, showing a Y construction for' moving the cutting blade. *i IAfThe machine comprisesa suitablebase or AA feature ofthe invention is the cutting" Speoication of Letters Patent. Patented Aug 11 1914 Application filed April 30, 1,908. Serial No. 430,141.

supporting framework A, in which is mounteda shaft B, driven from a suitable source of power in any suitable way, as by a belt passing over fastand loose pulleys B2, B2.

"The base .A carries at its left-hand side two horlzontally disposed projecting L- shaped arms A2, A2. These arms, together Withv the main portlon of the base A,- carry two sets ofguide rolls, the rolls of each vSetarrangedin a circle,and being located in different planes., vThe rolls C, of one of these sets, are shown as bevel-'edged disks mounted Ain projecting bearings C2. The

-rolls C? of the other set are mounted in similar bearings formed in the arms A2, A3, but in a much smaller circle. These two sets of rolls Serve to support and guide the cutting member.,v v v The cutting member comprises a cylindrical knife-Supporting frame D, of a general cupshape,i opened throughout axially and presenting the rearwardly extending bearing portion D2. This knife-supporting frame is moved in the planes of the supporting rolls,

, and lits upon and is supported and guided by the said rolls, so that it may-be rotated freely and with great speed thereon. For the purpose of so rotating it a belt E is herein shown, passing around a belt groove in the rearward projection D2 and around a grooved pulley E2 mounted on a shaft B.

The cutting blade D3 is constituted as a thin, flexible strip of. steel which may be readily bent into 'cylindrical shape and which is adapted to present a sharp cutting edge. This blade is tempered throughout so that it may be sharpened until the greater portion of it is worn away. It may then be replaced by a similar blade, and thus the cutting edge, which is the essential element of the skiving machine, may be` kept in perfect condition and renewed when finallyr worn out without affecting the remainder of the machine and at a very slight cost.

The cutting blade is placed upon the interior surface of the cylindrical knife-supportingframe D with its edge projecting slightly, and is' formed of such a length that its edges abut as closely as possible.

A split cylindrical clamping frame D4 is placed inside of and against the knife and is 'sprung outward sufliciently to expand it 'against theknife bymeans of the expansion 1screw D5 to, clamp and hold the knife firmly in place. lThis clamping frame is.

held from axial 4movement by `means of screws D3, passing through slots- 1n the knife-sup ortin frame D.

A grin g w eel F of emery, carborundum, or other suitable material, and=having it-s periphery convexed to conform to the concave inner edge of the cutting blade D3,`is'

mounted at the upper lpart of the machine on a transverse shaft F2, carried in' bearings F3, F4, vertically adjustable upon the end 'of the support-ing arm A2 and the opposite portion of the -framework to which they are clamped by the set-screws F3. .The shaft F2 is extended through ythe bearing F4, and

carries a pulley F, which. is driven by a @Y belt F 7, passing over idlers F3 to a pu feeding forward of the cutting blade is as follows: The cylindrical knife-supporting frame D is slotted longitudinally at several points, as at.D1, and provided with L- j' shaped bolts D12,one leg of which projects against the rearward edge of the blade D3, out through the slot D10, and the other leg of which lies along the exterior surface of the blade D3. The exterior surface of the cylindrical knife-supporting frame D is A screw-threaded, and a rin'gD13 screw-threaded and provided with an annulargroove on its inner surface is mounted thereon with the annular groove D12 fitting over the projecting ends of the bolts D12. It will thus be seen that upon rotation of the ring D13 the blade D3 will "be fed forward by the bolts D12. The ring D13 is rotated at the desired times by a friction pulley D2", providedwit-h a friction surface D21 of leather or other suitable material, and journaled ona shaft D22 mounted in a frame D23, pivoted about the shaft B. The shaft D22 is driven by a belt D24 extending over a pulley D23 on said shaft to a pulley D23 on the shaft B, and hence the friction pulley D2o is `constantly in rotation. A spring D3o tends to swing the frame D23 upwardly, so as to keep the pulley D20 out of contact with the ring D13..

A rod D31 extends from the frame D23 to any suitable device, such-as a. treadle, by.

ring D13, whereupon the cutting blade D3.

will be fed forward into contactwith the grinding wheel F, whereupon Lthe friction 1 f ne@ pulley is released, and the cuttingblade at once sharpened by the grinding Wheel.

' The cylindrical knife-supporting frame carries in the interior thereof a funnelshaped` member whose' purposev is to secure the ejection ofthe skivings. This cupshaped member G has a hollow projectin axial portion G2 fitting the ortion .D2 o the knlfe-supporting frame. he body portion of the funnel member G 'is'concaved or cup-shaped and its surface is a prolongation of a similar concaved or curved face D3 upon the interior .of the clamping frame D. The inner surface of the funnel member G is provided with. a series of deflecting Ablades G3, which serve toca-.tch the skivings and direct them upthroughthe axial opening out atV the back of themachine. 'This-'funnel member G isin frictional contact with the knife-supporting. frame and is consequently rotated thereby, but as its rapid rotation would cause the entanglement of the skivings and prevent their ready ejection a braking. deviceI-I is provided which is attached to the supporting arms A2, A3, and which is clamped with yan adjustable degree 4of pressure by means of the set-screw H2,

vagainst the projecting portion G2 of thefunnel-shaped member, solas to materially retard its rotation-and allow the skiVings-to'be fed slowly out through the axial opening.

The leather or materialto be skived is fed to the cutting knife by means of a pair of feeding rolls, bothof which are preferably positively driven. In the construction shown the lowermost of these feeding-rolls IP has a concave periphery P2, theV arc ofcurvature of which may'have the same but preferably hasa slightly lar er radius than that of the circular cutting e ge of the knife. vThis concave portion P2 of the periphery terminates in a cylindrical portion P3. The feeding roll P is mounted on a horizontalV shaft P3, so that the feeding roll is "directly below and its periphery' is in alinement with the' cutting edge.` The feeding roll P. with its shaft P4 extends transversely-of thecutting knife, and the shaft P.4 is extended through the base of the machine and carries at its rear end a gear P". The other feeding roll Ris provided with aconvexed periphery of the same curvature as lthat of the: cutting knife,"and sfmountedintcriorly of the cutting knife upon :rshaft R4 extending 4parallel to the shaft Pt' and provided `with a gear R3 intermeshing with the gear P3.

It is desirable that the, faces of the feeding rolls shall be substantially parallel l'at all stages of the adjustment of the rolls. In

.the construction illustratedthisresult is-suhstantially secured by mounting the' left end of theeshaft R1, ina vertically"hadl angularly movable yielding bearing ,Jheld down). wardlye; by fa spring`RT,-..a by placnga unilversahjointRs-"in thejshaft 'The feeding AlO nicer rolls are driven by a pulley S, mounted on the shaft P4 and connected toany ordinary form of transmitter by which the speed thereof may be controlled. i

A gage T for gaging the edge of the leather, V-shaped in cross-section to fit in the bight of th rolls P and R and provided with an extending guard ar'mT", to prevent the leather from being caught by the knife beyond the skiving portion, isA adjust-ably mounted by meansof a screw Ta on a block T4, whichy Ain turn is slidablyimounted in the framework A. The block Ti has screwthreaded therein an adjusting screw T5, mounted in a projection T6 from the frame A, so that upon t-urning the adjusting screw T5 the gage T may be adjusted transversely of the knife and in line with the feed rolls.

The shaft Pt is longitudinally movable. in its bearings and provided with a groove P1", into which a pin T1 from the block T* projects, so that the feed rol-l P is likewise adjusted longitudinally upon the movement of the adjusting screw T5. In this way the angle of the skiving may be varied. It will be seen that upon the movement of the feed.

roll P longitudinally the curved wedge- 'shaped opening between the feed' rolls P and R will'be enlarged, so that a more blunt skiving'will be cutvas the feed roll P is moved outwardly. Usually it is desired to have the'skived portion of the same width, and for this reason-the adjustmentV of the gage T with the feed roll P has been provided for, but as the gage T is independ ently adjustable upon the block T4 any desired width of skiving may be secured.

The operation of the machine will be apy parent from the foregoing description.- The feed roll P is adjusted by means ofthe screw T5 until the desired angle of the skiv ing is obtained and the gage T is adjusted to present the desired Width of skiving. The knife edge if not suiiici'ently 'sharp is made so by depressing the frame D23 and feeding forward the knife against the grinding roll until it is sharpened.' The leather to be skived is then introduced between the feed rolls, the roll R yielding for that purpose,

and the edge of the leather is guided against the gage T. The leather is at once fed through the machine by the feed rolls, the knife cutting olf the skiving which is seized by the slowly revolving blades of the funnel member G and fed out through the axial opening thereof.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is:

l. A skiving machine comprising a cylindrical rotary knife, and means for rotating it, a pair, one convex and one concave, of coperating feed rolls mounted transversely of and adjacent to said knife, an edge gage normally located at the minimum sect-ion Ithe angle of the; skiving,

together transversely of the knife to vary the angle of the skiving. v

2. A skiving machine comprising'` a cylindrical rotary knife, and means for rotating it, a pair, one convex and one concave,A of coperating feed rolls mounted transversely of and adjacent to said knife, an edge gage normally loca-ted at the minimum section line of the concave feed roll, means for adjusting said gage and said'concave feed'roll together transversely `of thel knife to vary and means whereby said gage may be independently adjusted longitudinally of said feed roll. f

3. A skiving machine 'comprising a cylindrical rotary knife and means for rotating it, a feeding roll mounted transversely of, within and adjacent to the edge of said knife and having a convex periphery conforming to said knife edge, a second feeding roll cooperating vvith the first and mounted transversely of, without and adjacent to the edge of said knife and having a concave periphery whose curvature is on a slightly greater radius than that of the knife edge, and means for longitudinally adjusting said concave feed roll transversely vary the angle of the skiving.

4. A knife for skiving or other machines comprising a cylindricalknife supporting frame constructed to rotate about the axis of the frame, a cyclindrical blade tting Within the frame, and clamping means within the 'blade for clamping it to the frame.

5. A knife for skiving or other machines comprising a cylindrical knife supporting frame, a'cylindrical blade fitting within the frame, and expansible clamping means within the blade for clamping it. to the frame.

6. A knife for skiving or'other machines comprising a knife supporting frame, a cylindrical blade-fitting within the frame, an interior support for the knife blade, and means for adjusting the blade relatively to bot-h the frameA and support while in position between them. 7. A skiving machine comprising a cylindrical axially opened knife supporting frame, rolls mounted exteriorly thereof for supporting and guiding said frames, means for rotatingsaid frame on said rolls, a 'discharging funnel in and loosely supported by said frame and rotatable thereby, and means for retarding the rotation of said funnel.

8. A skiving machine `comprising a cylindrical axially opened knifesupporting frame, rolls mounted exteriorly thereof for supporting and guiding said frame, means for rotating said frame onv said rolls, a discharging funnel in and loosely supported by ilo said frame and rotatable thereby,- means for retarding the rotation :of said funnel,l and guiding blades on the surface of said funnel to direct the skiving out'through the axial opening.

9. A skiving machine comprising a cylindrical knife-supporting frame, and means for rotating it, a thin, exible cutting blade, and means for clamping it to said supporting frame to present a circular projecting cutting edge, a grinding wheel mounted transversely of said knife and having its periphery conforming to the curve of said knife edge, means for rotating said grinding wheel, a ring lmounted on the exterior of said knife-supporting frame -to move axially thereof when rotated thereupon, means'for rotating said ring when desired, connections between said ring and said blade whereby' upon the rotation of the ring the blade is projected against the grinding wheel.

10. A skiving machine comprising a rotary cylindrical knife, a feed roll mounted outside the knife edge, a coperating presser arranged on the opposite side of t-he knife edge, an edge gage, and means for adjusting the gage and roll together transversely of the knife to vary the angle of the skiving.

11. A skiving machine comprising a rotary cylindrical knife, a feed roll mounted in fixed relation to the knife edge to det-ermine ,the bevel of the` skiving, a yielding presser on the opposite side of the knife edge, an edge gage, and means for adjusting the gage and roll together transversely of the knife to vary the angle of the skiving.

l2. A skiving machine comprising a rotary cylindrical knife, a feed roll mounted in fixed relation to the knife edge to determine the bevel of the skiving, a yielding presser on the opposite side of' the'knife` edge, means for adjusting the gage and roll l together transversely of the knife to vary the angle of the skiving, and means whereby saidl gage` may be"independently adjusted longitudinally of saidifeed roll.

13. A skiving machine comprising va rotary cylindrical knife, a feed roll outside of' the lmife having a 'cylindrical end adjacent the edge of the work and a concave end' ony lthe work side of the cylindrical end, the smaller diameter of which joins the cylindrical. portion of the roll, a presser on the 4opposite side of the knife edge, and means4 for adjusting the roll transversely of the knife to vary the angle of the'skiving.

14e.y A knife for skiving machines, having, in combination, a cylindrical blade, a cylindrical holder within which the blade fits, an

interior support fitting within the blade,.'

and means for effecting axial adjustment of the blade relatively to both the interior support and holder while in position between them.

1,5. A knife for skiving machines, having in combination, a cylindrical blade, -a cylindrical holder within which the blade fits, an expansible clampin ring itting within the blade, means for' e ecting axial adjust-- the blade, and a blade adjusting 'ring mov-,I able relatively to both the holder and sup" porting ring while the blade 1s in position' to adjust the blade axially.

In't-est-imony whereof, I have signed my name to this specification, in the presenceof two subscribing witnesses.

PAUL F. w. c. KRIPPENDORF. WVit-nesses MABEL'PARTELOW,

THOMAS J. DRUMMOND.

Copies of this patent mayr be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

